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Ferocactus is a genus of large barrel-shaped cacti, mostly with large spines and small flowers. There are about 30 species included in the genus. There are about 30 species included in the genus. They are found in the southwestern United States and northwestern Mexico.
Ferocactus hamatacanthus develops elongated glands, usually 2 centimetres (0.79 in) to 4 centimetres (1.6 in), in the aeroles between the flower and the spines. At first, these glands are soft, but as they mature they become hard and spine-like. Another key feature is the difference of its fruit compared to other species.
The plant blooms in spring to early summer, producing funnel-shaped flowers with a purple-red midvein and red,yellow to white margins, reaching lengths of up to 4 cm (1.6 in) and diameters of 3.5 cm (1.4 in). The elongated yellow fruits are about 2.5 cm (0.98 in) long and do not open at a basal pore.
Ferocactus haematacanthus is a solitary cactus with initially bluish-green, later green stems, growing up to 30-120 cm (47 in) tall and 25-36 cm (14 in) in diameter. The stems have 13-17 ribs and bear reddish thorns. Adult plants have merged areoles. The red spines consist of four central spines measuring 4 to 8 cm (1.6 to 3.1 in) long and six ...
The plant blooms from April and May. The funnel-shaped, yellow flowers are up to 6 cm (2.4 in) long and 5 cm (2.0 in) in diameter, while the spherical fruits are yellow, fleshy, and 2 to 4 cm (0.79 to 1.57 in) long.
The ribs are numerous and pronounced, and the spines are long and can range in color from yellow to tan to red, depending on the age of the plant and the species. Flowers appear at the top of the plant only after many years. The barrel cactus can live to be over 100 years old.
Ferocactus glaucescens is a solitary or branching cactus with spherical or cylindrical blue-green frosted shoots, growing up to 45 cm (18 in) in height and 60 cm (24 in) in diameter. The shoots have slightly depressed apices and 12 to 17 sharp-edged, non-tuberculated ribs with elongated areoles that are often connected.
Ferocactus johnstonianus is a solitary, spherical to short cylindrical cactus that can grow over 1 meter tall and up to 35 cm (14 in) in diameter. It has 24 to 31 slightly humped ribs and 22 to 25 golden-yellow, awl-shaped spines that turn brown with age and reach up to 6 cm (2.4 in) long, without differentiating into central and radial spines.